We wish to usethe Eval board 43362 based] to our target board based on LPC controller. We have a FTDI-Serial driver in our USB stack. Can we use the same to create the driver as required by BCM9WCD1EVAL1-B. If not, what are the changes we need to make in order to use our FTDI-Serial driver to function a Broadcom USB Serial Port.

Yes you can do the same serial interface to USB similar to BCM943362WCD4. Some information to setup the FTDI chip to relay serial port signals to USB can be found here WICED FTDI chip programming. The FTDI chip on the BCM943362WCD4 EVB interfaces UART and JTAG pins of the MCU to the USB.